“Circumstances are leading us to accelerate,” Hollande said in an opinion piecepublished by the Journal du Dimanche on Sunday. “What threatens us is not too much Europe, but a lack of it.”

While the euro zone has a common currency, fiscal and economic policies remain mostly in the hands of each member state. European Central Bank President Mario Draghi made a plea this week for deeper cooperation between the euro members after political squabbles over Greece almost led to a rupture in the single currency.

Countries in favor of more integration should move ahead, forming an “avant-garde,” Hollande said.

“Europe has let its institutions weaken and the 28 European Union member countries are struggling to agree to move ahead,” Hollande said on Sunday in a text which was also a homage to his mentor Jacques Delors, a former European Commission President who proposed similar ideas.

Draghi called for the creation of a shared treasury within 10 years in a joint proposal with politicians including European Commission President Jean-Claude Juncker and Eurogroup President Jeroen Dijsselbloem last month.